D: Glossary

The following list of technical terms shows the section of this booklet where each term is explained or first used:

Airy 1830 ellipsoid	2.2	ITRS	4.2
biaxial ellipsoid	2.2	latitude	3.1
datum	3.2	longitude	3.1
Cartesian coordinates	3.1	map projection	7
differential GPS	4.2	mean sea level	3.1
DORIS	4.2	meridian	3.1
ED50	1.2	Molodensky transformation	6.2
ellipsoid	2.2	National Grid	3.1
ellipsoid height	3.1	Ordnance Datum Newlyn	3.1
ephemerides	4.2	orthometric height	3.1
epoch	4.2	OSGB36	5.2
ETRF89	4.2	OSGM02	6.4
ETRS89	4.2	OSTN02	6.3
fiducial analysis	4.2	prime meridian	3.1
geodesy	1.1	realisation	3.3
geodetic datum	3.2	satellite positioning	3.3
geoid	2.3	SINEX	4.2
geoid height	3.1	SLR	4.2
GPS	1.1	terrestrial	1.1
gravimetry	2.3	terrestrial reference frame	3.3
GRS80	2.2	terrestrial reference system	3.2
Helmert transformation	6.2	transformation	6.1
IERS	4.2	VLBI	4.2
IGS	4.2	WGS84	4.1
ITRF	4.2

Ordnance Survey, the OS Symbol, OSGM02 and OSGB36 are registered trade marks and OSTN97
is a trade mark of Ordnance Survey, the national mapping agency of Great Britain.

Microsoft is a registered trademark of Microsoft Corp.

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